Trombone vibrato is a technique used by trombone players to add expression and warmth to their sound. It involves a slight, controlled variation in pitch, which is achieved by oscillating the slide position or altering the air pressure while playing. This creates a wavering effect that enhances musical phrases. There are different methods to produce vibrato on the trombone, including using the slide to create a subtle pitch change or employing breath control. Musicians often practice these techniques to develop a personal style, making their performances more engaging and dynamic.